The WD Red 1TB is a 2.5-inch internal hard drive suitable for NAS in small companies and for the home. Thanks to the integrated anti-vibration sensors, the drive vibrates less, which means the drive is quieter and lasts longer. The drive also has a variable drive speed, which makes it work faster when you're reading and writing a lot of data, and rotate slower when you're not using the NAS. This allows you to save power. The drive also removes the reading and writing button from the disk surface as soon as you stop processing files. This way, it wears less quickly and your drive is more durable.